CN117154917A - PoCXP device of high-speed image acquisition system and control method thereof - Google Patents
PoCXP device of high-speed image acquisition system and control method thereof Download PDFInfo
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- CN117154917A CN117154917A CN202310914069.4A CN202310914069A CN117154917A CN 117154917 A CN117154917 A CN 117154917A CN 202310914069 A CN202310914069 A CN 202310914069A CN 117154917 A CN117154917 A CN 117154917A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention discloses a PoCXP device of a high-speed image acquisition system and a control method thereof, wherein the device comprises a main power supply control circuit, an auxiliary power supply control circuit and a power supply detection unit which are arranged in a host, the main power supply control circuit comprises an on-off control unit, a connector and a coaxial cable, the main power supply is connected with a power supply input end of camera equipment sequentially, the control end of the on-off control unit is connected with an FPGA, the auxiliary power supply control circuit comprises a current limiting resistor R1 and a switching diode D1 which is opposite to the conduction direction of the main power supply, the auxiliary power supply is connected with the power supply input end of the camera equipment sequentially through the current limiting resistor R1, the switching diode D1, the connector and the coaxial cable, the driving voltage of the main power supply is larger than that of the auxiliary power supply, and when the main power supply is turned on, the connection between the auxiliary power supply and the camera equipment can be automatically turned off through the switching diode. The invention simplifies the circuit design of the auxiliary power supply and simplifies the enabling control logic of the auxiliary power supply.
Description
Technical Field
The invention relates to the power supply technology of an image acquisition system, in particular to a PoCXP device of a high-speed image acquisition system and a control method thereof.
Background
In a high-speed image acquisition system based on a CoaXPress interface, power supply is required to be carried out on camera equipment through the CoaXPress interface, and the CoaXPress power supply mode is PoCXP (Power over CoaXPress). PoCXP generally includes two parts of main power and auxiliary power, and main power is responsible for providing the power supply who satisfies the power requirement, and auxiliary power is responsible for detecting the connection condition of host computer and camera equipment.
The design idea of controlling the on-off of the main power supply (voltage source) and the auxiliary power supply (current source) according to the power supply detection result is provided in the CoaXPress specification, the on-off switches of the main power supply and the auxiliary power supply are mutually independent, and the on-off states of the auxiliary power supply and the main power supply are respectively controlled by detecting the current of the main power supply and the voltage of the auxiliary power supply. But it has the following disadvantages: firstly, an auxiliary power supply is introduced with a constant current source chip and a current source control circuit, so that the auxiliary power supply has high design cost and complex circuit structure; and the uncertainty exists in the interference condition between the main power supply and the auxiliary power supply, so that the interference exists between the control of the main power supply and the auxiliary power supply control circuit and the power supply output.
Therefore, there is a need for an effective means to achieve PoCXP power while solving the problems currently existing.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems existing in the prior art, the invention provides a PoCXP device of a high-speed image acquisition system and a control method thereof, which simplify the circuit design of an auxiliary power supply and simplify the enabling control logic of the auxiliary power supply.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the utility model provides a PoCXP device of high-speed image acquisition system, includes main power supply control circuit, auxiliary power supply control circuit and the power detection unit that sets up in the host computer, main power supply control circuit includes the break-make control unit, and main power supply passes through the break-make control unit and is connected with camera equipment's power input, auxiliary power supply control circuit includes current limiting resistor R1 and the switch diode D1 opposite with main power supply direction of conduction, auxiliary power supply loops through current limiting resistor R1, switch diode D1 and is connected with camera equipment's power input, main power supply's drive voltage V2 is greater than auxiliary power supply's drive voltage V1 for the main power supply cuts off the connection between auxiliary power supply and the camera equipment through switch diode when opening, power detection unit's first voltage detection end and switch diode D1's output are connected, power detection unit still is connected with the FPGA, the control end of break-make control unit is connected with the FPGA.
Further, the output end of the current limiting resistor R1 is connected with the positive electrode of the switching diode D1, the power input end of the camera equipment is provided with a detection resistor R3, the input end of the detection resistor R3 is sequentially connected with the connector, the negative electrode of the switching diode D1 and the output end of the on-off control unit through coaxial cables respectively, and the output end of the detection resistor R3 is grounded.
Further, a divider resistor R2 is arranged between the output end of the on-off control unit and the connector, and two ends of the divider resistor R2 are respectively connected with a second voltage detection end of the power supply detection unit.
Further, the power supply processing circuit comprises a main power supply conversion circuit and an auxiliary power supply conversion circuit, wherein the input ends of the main power supply conversion circuit and the auxiliary power supply conversion circuit are connected with an external power supply, the output end of the main power supply conversion circuit outputs a main power supply and is connected with the input end of the main power supply control circuit, and the output end of the auxiliary power supply conversion circuit outputs an auxiliary power supply and is connected with the input end of the auxiliary power supply control circuit.
Further, the main power supply conversion circuit and the auxiliary power supply conversion circuit each comprise a DC-DC power supply converter or an LDO linear voltage regulator.
The invention also provides a control method of the PoCXP device of any one of the high-speed image acquisition systems, which comprises the following steps:
s1) the FPGA sends a disable signal to the on-off control unit, so that the main power supply control circuit is in an off state, a voltage detection result of the power supply detection unit is obtained in real time, whether the host is normally connected with the camera equipment or not is judged according to the voltage detection result, if yes, the step S2 is executed, and otherwise, the step S1 is executed;
s2) the FPGA sends an enabling signal to the on-off control unit, so that the main power supply control circuit is in an on state, a current detection result of the power supply detection unit is obtained in real time, then power supply power is calculated according to the current detection result of the power supply detection unit, if the power supply power meets the power supply requirement, the step S3 is executed, and if the power supply power does not meet the power supply requirement, the image acquisition system is stopped and the image acquisition system is exited;
s3) collecting and transmitting high-speed image data.
Further, in step S1, when judging whether the host is connected to the camera device normally according to the voltage detection result, the method includes:
if the voltage detection result is a first value, the host is normally connected with the camera device, and the expression of the first value is as follows:
V3＝[(V1-Vd)/(R1+R3)]R3
wherein V1 is the driving voltage of the auxiliary power supply, vd is the voltage drop of the switching diode D1, R1 is the value of the current limiting resistor, and R3 is the value of the detection resistor of the camera device.
Further, in step S1, when judging whether the host is connected to the camera device normally according to the voltage detection result, the method includes:
if the voltage detection result is a second value, the connection between the host and the camera device is abnormal, and the expression of the second value is as follows:
V3＝V1-Vd
wherein V1 is the driving voltage of the auxiliary power supply, vd is the voltage drop of the switching diode D1.
Further, the step S2 of obtaining the current detection result of the power detection unit in real time further includes a step of calculating the current detection result by the power detection unit, and specifically includes: and obtaining voltage values of two ends of the voltage dividing resistor R2, dividing the difference of the voltage values of the two ends of the voltage dividing resistor R2 by the resistance value of the voltage dividing resistor R2 to obtain a current detection result, wherein the voltage dividing resistor R2 is arranged between the output end of the on-off control unit and the connector.
Further, when the power supply power in step S2 meets the power supply requirement, the method specifically includes: the power of the power supply is greater than or equal to a preset value.
Compared with the prior art, the invention has the advantages that:
1. the auxiliary power supply control circuit consists of the low-voltage auxiliary power supply, the current limiting resistor and the switching diode, can realize the power supply requirement of the auxiliary power supply through simple electronic devices, reduces the complexity of circuit design and saves cost.
2. In the control method, when the main power supply supplies power, the unidirectional diode is blocked by the high driving voltage of the main power supply, and the auxiliary power supply immediately stops supplying power; when the main power supply detects that the power supply is stopped abnormally, the auxiliary power supply is immediately conducted, and the connection condition of the host and the equipment is continuously detected. The control logic that the FPGA controls the auxiliary power supply control circuit to be turned on or off according to the detection result of the main power supply control circuit is simplified.
Drawings
Fig. 1 is a functional block diagram of a high-speed image acquisition system based on the CoaXPress interface.
Fig. 2 is a signal path diagram of a high-speed image acquisition system based on a CoaXPress interface.
Fig. 3 is a schematic block diagram of a PoCXP device in accordance with an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of a PoCXP device according to an embodiment of the present invention.
Fig. 5 is a flowchart of a control method according to an embodiment of the present invention.
Legend description: the device comprises a 1-main power supply control circuit, a 2-auxiliary power supply control circuit, a 3-power supply detection unit, an 11-on-off control unit and a 4-power supply processing circuit.
Detailed Description
The invention is further described below in connection with the drawings and the specific preferred embodiments, but the scope of protection of the invention is not limited thereby.
Before describing the specific embodiment of the present embodiment, related concepts will be described.
High-speed image acquisition system based on CoaXPress interface: the high-speed image acquisition system based on CoaXPress interface is composed of a host power module, a filter circuit, a connector, an isolation circuit, a host receiving module and an FPGA circuit, wherein the host power module in the system supplies power to the equipment power module in the camera equipment through the connector and the coaxial cable after passing through the filter circuit, the camera equipment is connected with the acquisition system through the coaxial cable after being electrified, the acquired high-speed image signal is connected with the host receiving module after passing through the isolation circuit, the host receiving module transmits data to the FPGA, the FPGA realizes the processing of the high-speed image signal, and the functional block diagram of the system is shown in figure 1 and comprises:
(1) And a host power supply module: providing a power supply with maximum 13W power for a single link in the camera equipment, and realizing the on-off detection function of the host and the camera equipment;
(2) And a filter circuit: filtering the low-frequency interference signals output by the host receiving module and the high-frequency interference signals output by the equipment transmitting module;
(3) A connector: connecting a filter circuit, an isolation circuit and an external coaxial cable in the acquisition system;
(4) An isolation circuit: isolating the direct current power supply signal output by the host power supply module in the acquisition system, and only allowing the image signal to pass through the isolating circuit to be transmitted to the host receiving module;
(5) And a host receiving module: for receiving high-speed serial data sent by the camera device and transmitting low-speed serial data;
(6) FPGA chip: realizing high-speed image signal acquisition and transmission control.
In the high-speed image acquisition system, the system mainly comprises 6 paths of signal channels, as shown in fig. 2: .
(1) When the host power module outputs a direct current power signal, the power signal is divided into two paths after passing through the filter circuit: the direct current signal of the first signal channel is transmitted to the camera equipment through the coaxial cable after passing through the connector, and the direct current signal of the second signal channel is isolated by the isolating circuit;
(2) When the host receiving module outputs a low-frequency signal, the low-frequency signal is divided into two paths through the isolating circuit: the low-frequency signal of the third signal channel is transmitted to the camera equipment through the coaxial cable after passing through the connector, and the low-frequency interference signal of the fourth signal channel is filtered by the filter circuit;
(3) The connector receives the high-frequency signal from the equipment transmitting module and then divides the high-frequency signal into two paths: the high-frequency interference signal of the signal channel five is filtered by the filter circuit, and the high-frequency signal of the signal channel six is transmitted to the host receiving module through the isolating circuit.
Example 1
In the CoaXPress specification, the existing method provides a design idea for controlling the on-off of a main power supply (voltage source) and an auxiliary power supply (current source) according to a power supply detection result, and the on-off switches of the main power supply and the auxiliary power supply are mutually independent. We find that it has the following problems:
(1) The auxiliary power supply has high design cost:
in the technical scheme of the existing high-speed image acquisition system based on the CoaXPress interface, an auxiliary power supply is required to provide a constant current signal for camera equipment, the connection state of a host and the camera equipment is judged by detecting the voltage division condition of a circuit when the auxiliary power supply supplies power, and in the prior art, in order to obtain the constant current signal, a constant current source chip and a current source control circuit are introduced, so that the design cost of the auxiliary power supply is higher. Aiming at the defects, we consider to design an auxiliary power circuit consisting of a low driving voltage, a current limiting resistor and a switching diode, and the components involved in the circuit are common and easy to obtain, so that the design cost can be effectively reduced.
(2) The auxiliary power supply control circuit enables control logic to be complex:
in the prior art, on-off control of an auxiliary power supply is realized in a software mode, a current detection result of a main power supply control circuit is transmitted to an FPGA by a power supply detection circuit, the FPGA further outputs an auxiliary power supply enabling control signal to act on the auxiliary power supply control circuit, so that the on-off condition of the auxiliary power supply is controlled, and the control logic is complex. In order to overcome the above disadvantages, we consider that the auxiliary power supply is controlled by the high driving voltage of the main power supply through the zener diode, when the main power supply is turned off, the auxiliary power supply outputs current through the switching diode, and when the main power supply is turned on, the high driving voltage of the main power supply is greater than the driving voltage of the auxiliary power supply, so that the output of the auxiliary power supply is blocked through the switching diode, and the effect of simplifying the auxiliary power supply enabling control logic is achieved.
Based on the above-mentioned conception, the present embodiment proposes a PoCXP device of a high-speed image acquisition system, which is implemented by a host power module in the acquisition system, as shown in fig. 3, and includes a main power control circuit 1, an auxiliary power control circuit 2 and a power detection unit 3, which are disposed in the host, where the main power control circuit 1 and the auxiliary power control circuit 2 are connected to a device power module of a camera device through connectors and coaxial cables in sequence, and the power detection circuit where the power detection unit 3 is combined to complete the power supply, power monitoring and on-off detection functions of the camera device.
In this embodiment, the main power control circuit 1 and the auxiliary power control circuit 2 together form a power control circuit, and the power control circuit specifically includes the main power control circuit 1 formed by the on-off control unit 11 and the auxiliary power control circuit 2 formed by the current limiting resistor R1 and the switching diode D1, where:
the on-off control unit 11 realizes an overcurrent protection function when the main power supply is in a working state, controls the on-off of the main power supply according to the power supply detection circuit, and can adopt an adjustable overcurrent protection load switch or adopt a series-connection self-recovery fuse and a common switch;
the current limiting resistor R1 is used for realizing a current limiting protection function in the auxiliary power supply channel;
the switching diode D1 is used for realizing the blocking control function of the auxiliary power supply channel, and the voltage drop is Vd;
the main power supply control circuit 1 defaults to be out of operation, and when the connection of the host and the equipment is detected, the on-off control unit 11 is enabled by the FPGA, and the main power supply control circuit outputs power supply;
when the main power supply control circuit outputs power, as shown in fig. 3, the output end of the current limiting resistor R1 is connected with the positive electrode of the switching diode D1, the negative electrode of the switching diode D1 is connected with the output end of the on-off control unit 11, and the main power supply control circuit outputs high driving voltage of the power supply to enable the switching diode D1 to be turned off, so that the auxiliary power supply is blocked.
In fig. 3, a main power supply is connected with a power input end of a camera device through an on-off control unit 11, an auxiliary power supply is connected with the power input end of the camera device through a current limiting resistor R1 and a switching diode D1 in sequence, a driving voltage V2 of the main power supply is larger than a driving voltage V1 of the auxiliary power supply, when the main power supply is turned on, the auxiliary power supply is turned off through the switching diode to be connected with the camera device, a first voltage detection end of a power detection unit 3 is connected with an output end of the switching diode D1, the power detection unit 3 is further connected with an FPGA, and a control end of the on-off control unit 11 is connected with the FPGA.
With the above structure, the auxiliary power supply control circuit in this embodiment is composed of the current limiting resistor R1 and the switching diode D1, and the input end of the current limiting resistor R1 is connected with the auxiliary power supply, thereby realizing the auxiliary power supply circuit with lower cost. When the main power supply is turned off, the auxiliary power supply outputs a current to the camera apparatus through the switching diode D1.
Further, based on the above structure, the embodiment defaults to be powered by the auxiliary power supply, and obtains the voltage value measured when the auxiliary power supply and the camera device are in the on-off state or the off state by detecting the auxiliary power supply detection voltage V3 at the output end of the auxiliary power supply control circuit 2, so that the connection state of the host computer of the high-speed image acquisition system and the camera device can be known, the on-off control unit 11 is controlled to be turned on after the connection is confirmed, the main power supply provides the driving power required by the camera device, and when the main power supply supplies power, the high driving voltage of the main power supply enables the switching diode D1 to be turned off, and then the auxiliary power supply is blocked, so that the auxiliary power supply enabling logic can be simplified.
In this embodiment, the power supply detection circuit can provide current detection for the main power supply control circuit 1 and voltage detection for the auxiliary power supply control circuit 2, respectively, and includes:
a power supply detection unit 3 for providing a main power supply current detection function and an auxiliary power supply voltage detection function, and a power supply detection chip may be employed;
as shown in fig. 3, the power input end of the camera device in this embodiment is provided with a detection resistor R3, the input end of the detection resistor R3 is connected with the connector and the negative electrode of the switch diode D1 and the output end of the voltage dividing resistor R2 in sequence through a coaxial cable, the input end of the voltage dividing resistor R2 is connected with the output end of the on-off control unit 11, the output end of the detection resistor R3 is grounded, and the auxiliary power detection voltage V3 is obtained by measuring the voltage dividing value of the current limiting resistor R1 and the detection resistor R3 in the external camera device, that is, the voltage value measured when the auxiliary power is in the on-off state or the off state, thereby realizing the voltage detection function of the auxiliary power circuit;
the main power supply detection function is that, as shown in fig. 3, a voltage dividing resistor R2 is disposed between the output end of the on-off control unit 11 and the connector, two ends of the voltage dividing resistor R2 are respectively connected with the second voltage detection end of the power supply detection unit 3, and the voltage value of two ends of the voltage dividing resistor R2 is measured by the power supply detection chip of the power supply detection unit 3, and the voltage value is calibrated and calculated in the power supply detection chip to obtain the current value in the main power supply channel, so as to realize the current detection function of the main power supply.
In fig. 3, the power control circuit accesses the input power through the power processing circuit 4, so that the input power outputs a voltage meeting the driving requirements of the main power and the auxiliary power after passing through the power processing circuit 4. The input power supply in this embodiment provides the power supply of the chip circuit in the acquisition system, and the power supply processing circuit 4 outputs the driving voltage required by the main power supply and the auxiliary power supply through the power conversion modes such as voltage transformation of the DC-DC power converter or voltage reduction of the LDO linear voltage regulator, specifically, the power supply processing circuit 4 includes a main power supply conversion circuit and an auxiliary power supply conversion circuit, both the main power supply conversion circuit and the auxiliary power supply conversion circuit include the DC-DC power converter or the LDO linear voltage regulator, the main power supply conversion circuit converts the input power supply into the main power supply with the driving voltage of V2 and outputs the main power supply, the auxiliary power supply conversion circuit converts the input power supply into the auxiliary power with the driving voltage of V1 and outputs the auxiliary power supply, both the input ends of the main power supply conversion circuit and the auxiliary power supply conversion circuit are connected with the external power supply, the output end of the main power supply conversion circuit is connected with the input end of the main power supply control circuit 1, and the output end of the auxiliary power supply conversion circuit is connected with the input end of the auxiliary power supply control circuit 2.
In this embodiment, the type of equalizer chip adopted by the host receiving module of the high-speed image acquisition system is EQCO62R20.3, and the equalizer chip can be replaced by an EQCO31R20 chip or an equalizer chip which is required by other manufacturers according to the transmission rate requirement, and the requirements of downlink transmission of 6.25Gbps maximum, uplink transmission of 20.833Mbps maximum and power transmission of 13W maximum power supply should be met on the selection of the connector type. If equalizer chips of other types are used, the interface connector should also meet the corresponding transmission requirements.
As shown in fig. 4, in the PoCXP device of the embodiment, the type of the adjustable overcurrent protection load switch of the on-off control unit 11 is an FPF2700MX device of the ONSEMI company, which can provide comprehensive protection for the system and the load in the overcurrent condition, the power detection chip in the power detection unit 3 adopts an INA220 device of the TI company, which can realize real-time monitoring of the power values of the main power supply and the auxiliary power supply, and can also be replaced by a device for separately detecting the voltage or the current, for example, a TS1102-100 current detection amplifier is used for carrying out the main power supply current detection function.
In order to ensure normal operation of the circuit, for the adjustable overcurrent protection load switch of the on-off control unit 11 in fig. 5, the pin 1 is connected with a main power supply, and is grounded through a capacitor of 22 μf, the pin 2 is connected with a 1.8V working voltage through a resistor of 10kΩ, the pin 3 is sequentially grounded through a resistor of 22.1kΩ and a resistor of 165kΩ, the pin 4 is connected with an FPGA, the pin 7 is connected with a 1.8V working voltage through a resistor of 10kΩ, and the pin 8 is connected with the input end of a voltage dividing resistor R2.
For the power detection chip of the power detection unit 3 in fig. 5, the pin No. 1 and the pin No. 2 are respectively grounded, the pin No. 6 is connected with a 3.3V working power supply and is grounded through a capacitor of 100nF, the pin No. 7 is grounded, the pin No. 8 is connected with the cathode of the switching diode D1 as a first voltage detection end, the pin No. 9 is connected with the output end of the voltage dividing resistor R2 through a resistor of 0R, the pin No. 10 is connected with the input end of the voltage dividing resistor R2 through a resistor of 0R, and the pin No. 9 is connected through a capacitor of 100 nF.
In fig. 4, the resistance of the current limiting resistor R1 is 2kΩ, the resistance of the voltage dividing resistor R2 is 8mΩ, and the output terminal of the voltage dividing resistor R2 is connected to the negative electrode of the switching diode D1.
Example two
When the high-speed image acquisition system in the first embodiment is in an operation state, only one power source is output from the host power source module and transmitted to the camera equipment end, and under a default condition, the main power source circuit is in an off state, the auxiliary power source circuit detects the connection condition of the host and the equipment, the main power source provides a driving power source required by the camera equipment after confirming the connection, and the switching diode D1 blocks the auxiliary power source circuit. As shown in fig. 5, the control flow is as follows:
(1) After the CoaXPress high-speed image acquisition system is started, connecting a host and camera equipment;
(2) At the moment, an auxiliary power supply provides a current signal for the camera equipment, and a main power supply does not provide power;
(3) When the host computer is communicated with the camera equipment, the auxiliary power supply driving voltage V1 provides power for the current limiting resistor R1 and the equipment end detection resistor R3, and at the moment, whether the host computer is normally connected with the camera equipment or not can be judged according to the voltage value condition of the auxiliary power supply detection voltage V3;
(4) If the auxiliary power supply detection voltage V3 is abnormal, repeating the steps (1) - (3); if the auxiliary power supply detection voltage V3 is detected normally, executing the following steps;
(5) After the host is normally connected with the camera equipment, the FPGA controls an adjustable overcurrent protection load switch on a main power circuit to enable, and the main power circuit is connected;
(6) At the moment, the main power supply can provide single-link high 13W power supply power for the camera equipment, and meanwhile, the single-link power supply power is calculated by detecting the current at the two ends of the voltage dividing resistor R2, so that whether the power supply power meets the power supply requirement is judged;
(7) When the power supply power meets the requirement, the CoaXPress high-speed image acquisition system continues to operate, and the acquisition and the transmission of high-speed image data are carried out; and stopping the system when the power supply power does not meet the requirement, and performing functional improvement on the CoaXPress high-speed image acquisition system.
Based on the above control flow, the present embodiment further proposes a control method of the PoCXP device of the high-speed image capturing system according to the first embodiment, as shown in fig. 5, including the following steps:
s1) the FPGA sends a disable signal to the on-off control unit 11, so that the main power supply control circuit 1 is in an off state, the voltage detection result of the power supply detection unit 3 is obtained in real time, whether the host is normally connected with the camera equipment or not is judged according to the voltage detection result, if yes, the step S2 is executed, and otherwise, the step S1 is executed;
s2) the FPGA sends an enabling signal to the on-off control unit 11, so that the main power supply control circuit 1 is in an on state, a current detection result of the power supply detection unit 3 is obtained in real time, then the power supply power is calculated according to the current detection result of the power supply detection unit 3, if the power supply power meets the power supply requirement, the step S3 is executed, and if the power supply power does not meet the power supply requirement, the image acquisition system is stopped and the image acquisition system is exited;
s3) collecting and transmitting high-speed image data.
In step S1 of the present embodiment, when judging whether the host and the camera device are connected normally according to the voltage detection result, the method includes:
if the voltage detection result is a first value, the host is normally connected with the camera device, and the expression of the first value is as follows:
V3＝[(V1-Vd)/(R1+R3)]R3 (1)
correspondingly, when the host is normally connected with the camera equipment, the calculation formula of the current I1 in the auxiliary power supply channel between the auxiliary power supply and the camera equipment is as follows:
I1＝(V1-Vd)/(R1+R3) (2)
wherein V1 is the driving voltage of the auxiliary power supply, vd is the voltage drop of the switching diode D1, R1 is the value of the current limiting resistor, and R3 is the value of the detection resistor of the camera device;
if the voltage detection result is a second value, the connection between the host and the camera device is abnormal (i.e. the host is not connected or disconnected with the camera device), and the expression of the second value is as follows:
V3＝V1-Vd (3)
correspondingly, when the connection between the host and the camera equipment is abnormal, the calculation formula of the current I2 in the auxiliary power supply channel between the auxiliary power supply and the camera equipment is as follows:
I2＝ (V1-Vd)/R1 (4)
wherein V1 is the driving voltage of the auxiliary power supply, vd is the voltage drop of the switching diode D1, and R1 is the value of the current limiting resistor.
Since the driving voltage V1 of the auxiliary power supply, the voltage drop Vd of the switching diode D1, the value of the current limiting resistor R1, and the value of the detection resistor R3 of the camera device are all known in the circuit design, based on the formula (2) and the formula (4), the corresponding current theoretical value can be directly calculated, so as to provide a reference for verifying the correctness of the power supply detection unit 3, so that in step S1 of the embodiment, when judging whether the host and the camera device are normally connected according to the voltage detection result, the method further comprises:
if the voltage detection result is not the first value or the second value, measuring the current in the auxiliary power supply channel between the auxiliary power supply and the camera equipment through a tool such as a universal meter, if the current detection value is different from I1 and I2, judging that the components in the power supply processing circuit 4 are possibly problematic, if the current detection value is the same as I1 or I2, judging that the components in the power supply detection unit 3 are possibly problematic, stopping the image acquisition system, and performing maintenance work for the corresponding functional units. How to examine normal components and find abnormal components in the overhaul work can be solved by the skilled person by adopting a well-known method, and the scheme is not improved, and the specific process is not repeated here.
Further, since I2 calculated by the formula (4) is a theoretical value of current in the auxiliary power channel between the auxiliary power source and the camera device when the host is abnormally connected with the camera device, the theoretical value may also be used as a design reference condition of the current limiting resistor R2, for example, when the current I2 of the auxiliary power channel between the auxiliary power source and the camera device flows into the power source detection unit, the current limiting resistor R2 is selected appropriately, so that when the main power channel between the main power source and the camera device is turned on, the current flowing into the power source detection unit 3 is also smaller than the certain value. How to select an appropriate current limiting resistor R2 to meet this requirement can be solved by those skilled in the art using well known methods, and the present solution is not modified, and detailed procedures are not repeated here.
In this embodiment, the step S2 of obtaining the current detection result of the power detection unit 3 in real time further includes the step of calculating the current detection result by the power detection unit 3, and specifically includes: and obtaining voltage values of two ends of the voltage dividing resistor R2, and dividing the difference of the voltage values of the two ends of the voltage dividing resistor R2 by the resistance value of the voltage dividing resistor R2 to obtain a current detection result.
In this embodiment, when calculating the power of the power supply according to the current detection result of the power supply detection unit 3 in step S2, the method includes: and obtaining the voltage value of the output end of the voltage dividing resistor R2, and multiplying the current detection result by the voltage value of the output end to obtain the power supply.
In this embodiment, when the power supply power in step S2 meets the power supply requirement, the method specifically includes: the power of the power supply is greater than or equal to a preset value, and the power threshold of the single camera device in this embodiment is set to 13W.
In summary, the invention adopts the auxiliary power supply design composed of low driving voltage, current limiting resistor and switching diode, and in terms of circuit structure, the invention can realize the power supply requirement of the auxiliary power supply through simple electronic devices, thereby reducing the complexity of circuit design; the device used by the invention is common and cheap in design cost, and the cost is saved. When the main power supply supplies power, the unidirectional diode is blocked by the high driving voltage of the main power supply, and the auxiliary power supply immediately stops supplying power; when the main power supply detects that the power supply is abnormally stopped, the auxiliary power supply is immediately conducted, and the connection condition of the host and the equipment is continuously detected through the power supply detection circuit. The control method is stable, and the control logic for controlling the on or off of the auxiliary power supply circuit by the FPGA according to the detection result of the main power supply circuit is simplified.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.
Claims (10)
1. The PoCXP device of the high-speed image acquisition system is characterized by comprising a main power supply control circuit (1), an auxiliary power supply control circuit (2) and a power supply detection unit (3) which are arranged in a host, wherein the main power supply control circuit (1) comprises an on-off control unit (11), the main power supply is connected with a power supply input end of camera equipment through the on-off control unit (11), the auxiliary power supply control circuit (2) comprises a current limiting resistor R1 and a switching diode D1 opposite to the on direction of the main power supply, the auxiliary power supply is connected with the power supply input end of the camera equipment sequentially through the current limiting resistor R1 and the switching diode D1, the driving voltage V2 of the main power supply is larger than the driving voltage V1 of the auxiliary power supply, the main power supply is connected with the camera equipment through the switching diode, a first voltage detection end of the power supply detection unit (3) is connected with an output end of the switching diode D1, the power supply detection unit (3) is further connected with an FPGA, and the control end of the on-off control unit (11) is connected with the FPGA.
2. The PoCXP device of the high-speed image acquisition system according to claim 1, wherein the output end of the current limiting resistor R1 is connected with the positive electrode of the switching diode D1, the power input end of the camera equipment is provided with a detection resistor R3, the input end of the detection resistor R3 is sequentially connected with the connector, the negative electrode of the switching diode D1 and the output end of the on-off control unit (11) through a coaxial cable, and the output end of the detection resistor R3 is grounded.
3. The PoCXP device of the high-speed image acquisition system according to claim 2, wherein a divider resistor R2 is arranged between the output end of the on-off control unit (11) and the connector, and two ends of the divider resistor R2 are respectively connected with a second voltage detection end of the power supply detection unit (3).
4. The PoCXP device of the high-speed image acquisition system according to claim 1, further comprising a power supply processing circuit (4), wherein the power supply processing circuit (4) comprises a main power supply conversion circuit and an auxiliary power supply conversion circuit, the input ends of the main power supply conversion circuit and the auxiliary power supply conversion circuit are connected with an external power supply, the output end of the main power supply conversion circuit outputs a main power supply and is connected with the input end of the main power supply control circuit (1), and the output end of the auxiliary power supply conversion circuit outputs an auxiliary power supply and is connected with the input end of the auxiliary power supply control circuit (2).
5. The PoCXP device of the high-speed image capture system of claim 4, wherein the primary and auxiliary power conversion circuits each comprise a DC-DC power converter or an LDO linear regulator.
6. The control method of the PoCXP device of the high-speed image capturing system according to any one of claims 1 to 5, comprising the steps of:
s1) the FPGA sends a disable signal to the on-off control unit (11), so that the main power supply control circuit (1) is in an off state, a voltage detection result of the power supply detection unit (3) is obtained in real time, whether the host is normally connected with the camera equipment or not is judged according to the voltage detection result, if yes, the step S2 is executed, and otherwise, the step S1 is executed;
s2) the FPGA sends an enabling signal to the on-off control unit (11), so that the main power supply control circuit (1) is in an on state, a current detection result of the power supply detection unit (3) is obtained in real time, then power supply power is calculated according to the current detection result of the power supply detection unit (3), if the power supply power meets the power supply requirement, the step S3 is executed, and if the power supply power does not meet the power supply requirement, the image acquisition system is stopped and the system is withdrawn;
s3) collecting and transmitting high-speed image data.
7. The method for controlling a PoCXP device in a high-speed image capturing system according to claim 6, wherein when judging whether the host and the camera device are normally connected according to the voltage detection result in step S1, the method comprises:
if the voltage detection result is a first value, the host is normally connected with the camera device, and the expression of the first value is as follows:
V3＝[(V1-Vd)/(R1+R3)]R3
wherein V1 is the driving voltage of the auxiliary power supply, vd is the voltage drop of the switching diode D1, R1 is the value of the current limiting resistor, and R3 is the value of the detection resistor of the camera device.
8. The method for controlling a PoCXP device in a high-speed image capturing system according to claim 6, wherein when judging whether the host and the camera device are normally connected according to the voltage detection result in step S1, the method comprises:
if the voltage detection result is a second value, the connection between the host and the camera device is abnormal, and the expression of the second value is as follows:
V3＝V1-Vd
wherein V1 is the driving voltage of the auxiliary power supply, vd is the voltage drop of the switching diode D1.
9. The control method of the PoCXP device of the high-speed image capturing system according to claim 6, wherein the step S2 of obtaining the current detection result of the power supply detecting unit (3) in real time further comprises the step of calculating the current detection result by the power supply detecting unit (3), specifically comprising: and obtaining voltage values of two ends of the voltage dividing resistor R2, dividing the difference of the voltage values of the two ends of the voltage dividing resistor R2 by the resistance value of the voltage dividing resistor R2 to obtain a current detection result, wherein the voltage dividing resistor R2 is arranged between the output end of the on-off control unit (11) and the connector.
10. The control method of the PoCXP device of the high-speed image capturing system according to claim 6, wherein when the power supply requirement is met in the step S2, the control method specifically comprises: the power of the power supply is greater than or equal to a preset value.
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| CN202310914069.4A CN117154917A (en) | 2023-07-24 | 2023-07-24 | PoCXP device of high-speed image acquisition system and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310914069.4A CN117154917A (en) | 2023-07-24 | 2023-07-24 | PoCXP device of high-speed image acquisition system and control method thereof |
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